I Take Relationships Seriously

I recently started to talk to my Ex Wife again. Both of us started getting them feelings again and it feels great! She cheated on me and it ultimately destroyed the relationship. We both have been very open and she was talking about her relationship with the man after we split. He was cheating on her the entire time. Part of me finds it hysterical, part of me wants to destroy this dudes very existence for hurting her the way he did.